On Saturday 13 August 2005 2:04 pm, David Brownell wrote:
> Among other things, this will speed up the TX path for minidrivers
> that need extra headers.
This has a few other minor cleanups now too.
This starts to prepare the core of "usbnet" to know less about various
framing protocols that map Ethernet packets onto USB, so "minidrivers"
can be modules that just plug into the core.
- Remove some framing-specific code that cluttered the core:
* net->hard_header_len records how much space to preallocate;
now drivers that add their own framing (Net1080, GeneLink,
Zaurus, RNDIS, some ASIX versions) will have faster TX paths.
Even for the drivers (Zaurus, Net1080) that need trailers.
* defines new dev->hard_mtu, using this "hardware" limit to
reject some changes to the link's settable "software" mtu.
* now net->hard_header_len and dev->hard_mtu are set up in the
driver bind() routines, if needed.
- Transaction ID is no longer specific to the Net1080 framing;
RNDIS needs one too.
- Creates a new "usbnet.h" header with declarations that are shared
between the core and what will be separate modules.
- Plus a couple other minor tweaks.
The core code is only about 1/3 of this large file. Splitting out the
minidrivers into separate modules (e.g. ones for ASIX adapters,
Zaurii and similar, CDC Ethernet, etc), being done in later patches,
will improve maintainability and shrink the runtime footprint.
Signed-off-by: David Brownell <[EMAIL PROTECTED]>
--- g26.orig/drivers/usb/net/Kconfig 2005-08-23 23:44:38.000000000 -0700
+++ g26/drivers/usb/net/Kconfig 2005-08-24 00:10:19.000000000 -0700
@@ -247,6 +247,7 @@ config USB_CDCETHER
CDC Ethernet is an implementation option for DOCSIS cable modems
that support USB connectivity, used for non-Microsoft USB hosts.
+ The Linux-USB CDC Ethernet Gadget driver is an open implementation.
This driver should work with at least the following devices:
* Ericsson PipeRider (all variants)
--- g26.orig/drivers/usb/net/usbnet.c 2005-08-24 00:10:10.000000000 -0700
+++ g26/drivers/usb/net/usbnet.c 2005-08-24 00:10:19.000000000 -0700
@@ -1,6 +1,6 @@
/*
* USB Networking Links
- * Copyright (C) 2000-2005 by David Brownell <[EMAIL PROTECTED]>
+ * Copyright (C) 2000-2005 by David Brownell
* Copyright (C) 2002 Pavel Machek <[EMAIL PROTECTED]>
* Copyright (C) 2003-2005 David Hollis <[EMAIL PROTECTED]>
* Copyright (C) 2005 Phil Chang <[EMAIL PROTECTED]>
@@ -126,19 +126,18 @@
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
-#include <linux/random.h>
#include <linux/ethtool.h>
#include <linux/workqueue.h>
#include <linux/mii.h>
-#include <asm/uaccess.h>
-#include <asm/unaligned.h>
#include <linux/usb.h>
-#include <asm/io.h>
-#include <asm/scatterlist.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
-#define DRIVER_VERSION "03-Nov-2004"
+#include <asm/unaligned.h>
+
+#include "usbnet.h"
+
+#define DRIVER_VERSION "22-Aug-2005"
/*-------------------------------------------------------------------------*/
@@ -149,14 +148,16 @@
* One maximum size Ethernet packet takes twenty four of them.
* For high speed, each frame comfortably fits almost 36 max size
* Ethernet packets (so queues should be bigger).
+ *
+ * REVISIT qlens should be members of 'struct usbnet'; the goal is to
+ * let the USB host controller be busy for 5msec or more before an irq
+ * is required, under load. Jumbograms change the equation.
*/
#define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? 60 : 4)
#define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? 60 : 4)
-// packets are always ethernet inside
-// ... except they can be bigger (limit of 64K with NetChip framing)
+/* packets are always ethernet, sometimes wrapped in other framing */
#define MIN_PACKET sizeof(struct ethhdr)
-#define MAX_PACKET 32768
// reawaken network queue this soon after stopping; else watchdog barks
#define TX_TIMEOUT_JIFFIES (5*HZ)
@@ -166,7 +167,7 @@
#define THROTTLE_JIFFIES (HZ/8)
// for vendor-specific control operations
-#define CONTROL_TIMEOUT_MS 500
+#define CONTROL_TIMEOUT_MS USB_CTRL_GET_TIMEOUT
// between wakeups
#define UNLINK_TIMEOUT_MS 3
@@ -176,109 +177,6 @@
// randomly generated ethernet address
static u8 node_id [ETH_ALEN];
-// state we keep for each device we handle
-struct usbnet {
- // housekeeping
- struct usb_device *udev;
- struct driver_info *driver_info;
- wait_queue_head_t *wait;
-
- // i/o info: pipes etc
- unsigned in, out;
- struct usb_host_endpoint *status;
- unsigned maxpacket;
- struct timer_list delay;
-
- // protocol/interface state
- struct net_device *net;
- struct net_device_stats stats;
- int msg_enable;
- unsigned long data [5];
-
- struct mii_if_info mii;
-
- // various kinds of pending driver work
- struct sk_buff_head rxq;
- struct sk_buff_head txq;
- struct sk_buff_head done;
- struct urb *interrupt;
- struct tasklet_struct bh;
-
- struct work_struct kevent;
- unsigned long flags;
-# define EVENT_TX_HALT 0
-# define EVENT_RX_HALT 1
-# define EVENT_RX_MEMORY 2
-# define EVENT_STS_SPLIT 3
-# define EVENT_LINK_RESET 4
-};
-
-// device-specific info used by the driver
-struct driver_info {
- char *description;
-
- int flags;
-/* framing is CDC Ethernet, not writing ZLPs (hw issues), or optionally: */
-#define FLAG_FRAMING_NC 0x0001 /* guard against device dropouts */
-#define FLAG_FRAMING_GL 0x0002 /* genelink batches packets */
-#define FLAG_FRAMING_Z 0x0004 /* zaurus adds a trailer */
-#define FLAG_FRAMING_RN 0x0008 /* RNDIS batches, plus huge header */
-
-#define FLAG_NO_SETINT 0x0010 /* device can't set_interface() */
-#define FLAG_ETHER 0x0020 /* maybe use "eth%d" names */
-
-#define FLAG_FRAMING_AX 0x0040 /* AX88772/178 packets */
-
- /* init device ... can sleep, or cause probe() failure */
- int (*bind)(struct usbnet *, struct usb_interface *);
-
- /* cleanup device ... can sleep, but can't fail */
- void (*unbind)(struct usbnet *, struct usb_interface *);
-
- /* reset device ... can sleep */
- int (*reset)(struct usbnet *);
-
- /* see if peer is connected ... can sleep */
- int (*check_connect)(struct usbnet *);
-
- /* for status polling */
- void (*status)(struct usbnet *, struct urb *);
-
- /* link reset handling, called from defer_kevent */
- int (*link_reset)(struct usbnet *);
-
- /* fixup rx packet (strip framing) */
- int (*rx_fixup)(struct usbnet *dev, struct sk_buff *skb);
-
- /* fixup tx packet (add framing) */
- struct sk_buff *(*tx_fixup)(struct usbnet *dev,
- struct sk_buff *skb, unsigned flags);
-
- // FIXME -- also an interrupt mechanism
- // useful for at least PL2301/2302 and GL620USB-A
- // and CDC use them to report 'is it connected' changes
-
- /* for new devices, use the descriptor-reading code instead */
- int in; /* rx endpoint */
- int out; /* tx endpoint */
-
- unsigned long data; /* Misc driver specific data */
-};
-
-// we record the state for each of our queued skbs
-enum skb_state {
- illegal = 0,
- tx_start, tx_done,
- rx_start, rx_done, rx_cleanup
-};
-
-struct skb_data { // skb->cb is one of these
- struct urb *urb;
- struct usbnet *dev;
- enum skb_state state;
- size_t length;
-};
-
static const char driver_name [] = "usbnet";
/* use ethtool to change the level for any given device */
@@ -286,22 +184,6 @@ static int msg_level = -1;
module_param (msg_level, int, 0);
MODULE_PARM_DESC (msg_level, "Override default message level");
-
-#ifdef DEBUG
-#define devdbg(usbnet, fmt, arg...) \
- printk(KERN_DEBUG "%s: " fmt "\n" , (usbnet)->net->name , ## arg)
-#else
-#define devdbg(usbnet, fmt, arg...) do {} while(0)
-#endif
-
-#define deverr(usbnet, fmt, arg...) \
- printk(KERN_ERR "%s: " fmt "\n" , (usbnet)->net->name , ## arg)
-#define devwarn(usbnet, fmt, arg...) \
- printk(KERN_WARNING "%s: " fmt "\n" , (usbnet)->net->name , ## arg)
-
-#define devinfo(usbnet, fmt, arg...) \
- printk(KERN_INFO "%s: " fmt "\n" , (usbnet)->net->name , ## arg); \
-
/*-------------------------------------------------------------------------*/
static void usbnet_get_drvinfo (struct net_device *, struct ethtool_drvinfo *);
@@ -921,6 +803,11 @@ static int ax8817x_bind(struct usbnet *d
ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP);
mii_nway_restart(&dev->mii);
+ if (dev->driver_info->flags & FLAG_FRAMING_AX) {
+ /* REVISIT: adjust hard_header_len too */
+ dev->hard_mtu = 2048;
+ }
+
return 0;
out2:
kfree(buf);
@@ -1432,9 +1319,8 @@ static int generic_cdc_bind (struct usbn
info->ether->bLength);
goto bad_desc;
}
- dev->net->mtu = le16_to_cpup (
- &info->ether->wMaxSegmentSize)
- - ETH_HLEN;
+ dev->hard_mtu = le16_to_cpu(
+ info->ether->wMaxSegmentSize);
/* because of Zaurus, we may be ignoring the host
* side link address we were given.
*/
@@ -1988,9 +1874,17 @@ genelink_tx_fixup (struct usbnet *dev, s
return skb;
}
+static int genelink_bind (struct usbnet *dev, struct usb_interface *intf)
+{
+ dev->hard_mtu = GL_RCV_BUF_SIZE;
+ dev->net->hard_header_len += 4;
+ return 0;
+}
+
static const struct driver_info genelink_info = {
.description = "Genesys GeneLink",
.flags = FLAG_FRAMING_GL | FLAG_NO_SETINT,
+ .bind = genelink_bind,
.rx_fixup = genelink_rx_fixup,
.tx_fixup = genelink_tx_fixup,
@@ -2015,7 +1909,6 @@ static const struct driver_info genelink
*
*-------------------------------------------------------------------------*/
-#define dev_packet_id data[0]
#define frame_errors data[1]
/*
@@ -2057,6 +1950,9 @@ struct nc_trailer {
#define MIN_FRAMED FRAMED_SIZE(0)
+/* packets _could_ be up to 64KB... */
+#define NC_MAX_PACKET 32767
+
/*
* Zero means no timeout; else, how long a 64 byte bulk packet may be queued
@@ -2398,16 +2294,14 @@ static void nc_ensure_sync (struct usbne
static int net1080_rx_fixup (struct usbnet *dev, struct sk_buff *skb)
{
struct nc_header *header;
+ struct net_device *net = dev->net;
struct nc_trailer *trailer;
u16 hdr_len, packet_len;
- if (!(skb->len & 0x01)
- || MIN_FRAMED > skb->len
- || skb->len > FRAMED_SIZE (dev->net->mtu)) {
+ if (!(skb->len & 0x01)) {
dev->stats.rx_frame_errors++;
dbg ("rx framesize %d range %d..%d mtu %d", skb->len,
- (int)MIN_FRAMED, (int)FRAMED_SIZE (dev->net->mtu),
- dev->net->mtu);
+ net->hard_header_len, dev->hard_mtu, net->mtu);
nc_ensure_sync (dev);
return 0;
}
@@ -2415,7 +2309,7 @@ static int net1080_rx_fixup (struct usbn
header = (struct nc_header *) skb->data;
hdr_len = le16_to_cpup (&header->hdr_len);
packet_len = le16_to_cpup (&header->packet_len);
- if (FRAMED_SIZE (packet_len) > MAX_PACKET) {
+ if (FRAMED_SIZE (packet_len) > NC_MAX_PACKET) {
dev->stats.rx_frame_errors++;
dbg ("packet too big, %d", packet_len);
nc_ensure_sync (dev);
@@ -2505,11 +2399,23 @@ net1080_tx_fixup (struct usbnet *dev, st
return skb2;
}
+static int net1080_bind (struct usbnet *dev, struct usb_interface *intf)
+{
+ unsigned extra = sizeof (struct nc_header)
+ + 1
+ + sizeof (struct nc_trailer);
+
+ dev->net->hard_header_len += extra;
+ dev->hard_mtu = NC_MAX_PACKET;
+ return 0;
+}
+
static const struct driver_info net1080_info = {
.description = "NetChip TurboCONNECT",
.flags = FLAG_FRAMING_NC,
+ .bind = net1080_bind,
.reset = net1080_reset,
- .check_connect =net1080_check_connect,
+ .check_connect = net1080_check_connect,
.rx_fixup = net1080_rx_fixup,
.tx_fixup = net1080_tx_fixup,
};
@@ -2690,11 +2596,20 @@ done:
return skb;
}
+static int zaurus_bind (struct usbnet *dev, struct usb_interface *intf)
+{
+ /* Belcarra's funky framing has other options; mostly
+ * TRAILERS (!) with 4 bytes CRC, and maybe 2 pad bytes.
+ */
+ dev->net->hard_header_len += 6;
+ return generic_cdc_bind(dev, intf);
+}
+
static const struct driver_info zaurus_sl5x00_info = {
.description = "Sharp Zaurus SL-5x00",
.flags = FLAG_FRAMING_Z,
.check_connect = always_connected,
- .bind = generic_cdc_bind,
+ .bind = zaurus_bind,
.unbind = cdc_unbind,
.tx_fixup = zaurus_tx_fixup,
};
@@ -2704,7 +2619,7 @@ static const struct driver_info zaurus_p
.description = "Sharp Zaurus, PXA-2xx based",
.flags = FLAG_FRAMING_Z,
.check_connect = always_connected,
- .bind = generic_cdc_bind,
+ .bind = zaurus_bind,
.unbind = cdc_unbind,
.tx_fixup = zaurus_tx_fixup,
};
@@ -2714,7 +2629,7 @@ static const struct driver_info olympus_
.description = "Olympus R1000",
.flags = FLAG_FRAMING_Z,
.check_connect = always_connected,
- .bind = generic_cdc_bind,
+ .bind = zaurus_bind,
.unbind = cdc_unbind,
.tx_fixup = zaurus_tx_fixup,
};
@@ -2868,22 +2783,12 @@ static const struct driver_info bogus_md
static int usbnet_change_mtu (struct net_device *net, int new_mtu)
{
struct usbnet *dev = netdev_priv(net);
+ int ll_mtu = new_mtu + net->hard_header_len;
- if (new_mtu <= MIN_PACKET || new_mtu > MAX_PACKET)
- return -EINVAL;
-#ifdef CONFIG_USB_NET1080
- if (((dev->driver_info->flags) & FLAG_FRAMING_NC)) {
- if (FRAMED_SIZE (new_mtu) > MAX_PACKET)
- return -EINVAL;
- }
-#endif
-#ifdef CONFIG_USB_GENESYS
- if (((dev->driver_info->flags) & FLAG_FRAMING_GL)
- && new_mtu > GL_MAX_PACKET_LEN)
+ if (new_mtu <= 0 || ll_mtu > dev->hard_mtu)
return -EINVAL;
-#endif
// no second zero-length packet read wanted after mtu-sized packets
- if (((new_mtu + sizeof (struct ethhdr)) % dev->maxpacket) == 0)
+ if ((ll_mtu % dev->maxpacket) == 0)
return -EDOM;
net->mtu = new_mtu;
return 0;
@@ -2944,33 +2849,8 @@ static void rx_submit (struct usbnet *de
unsigned long lockflags;
size_t size;
-#ifdef CONFIG_USB_NET1080
- if (dev->driver_info->flags & FLAG_FRAMING_NC)
- size = FRAMED_SIZE (dev->net->mtu);
- else
-#endif
-#ifdef CONFIG_USB_GENESYS
- if (dev->driver_info->flags & FLAG_FRAMING_GL)
- size = GL_RCV_BUF_SIZE;
- else
-#endif
-#ifdef CONFIG_USB_ZAURUS
- if (dev->driver_info->flags & FLAG_FRAMING_Z)
- size = 6 + (sizeof (struct ethhdr) + dev->net->mtu);
- else
-#endif
-#ifdef CONFIG_USB_RNDIS
- if (dev->driver_info->flags & FLAG_FRAMING_RN)
- size = RNDIS_MAX_TRANSFER;
- else
-#endif
-#ifdef CONFIG_USB_AX8817X
- if (dev->driver_info->flags & FLAG_FRAMING_AX)
- size = 2048;
- else
-#endif
- size = (sizeof (struct ethhdr) + dev->net->mtu);
-
+ size = max(dev->net->hard_header_len + dev->net->mtu,
+ (unsigned)ETH_FRAME_LEN);
if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
if (netif_msg_rx_err (dev))
devdbg (dev, "no rx skb");
@@ -3064,7 +2944,7 @@ static void rx_complete (struct urb *urb
switch (urb_status) {
// success
case 0:
- if (MIN_PACKET > skb->len || skb->len > MAX_PACKET) {
+ if (skb->len < dev->net->hard_header_len) {
entry->state = rx_cleanup;
dev->stats.rx_errors++;
dev->stats.rx_length_errors++;
@@ -3336,11 +3216,11 @@ static u32 usbnet_get_link (struct net_d
{
struct usbnet *dev = netdev_priv(net);
- /* If a check_connect is defined, return it's results */
+ /* If a check_connect is defined, return its result */
if (dev->driver_info->check_connect)
return dev->driver_info->check_connect (dev) == 0;
- /* Otherwise, we're up to avoid breaking scripts */
+ /* Otherwise, say we're up (to avoid breaking scripts) */
return 1;
}
@@ -3577,7 +3457,7 @@ static int usbnet_start_xmit (struct sk_
#ifdef CONFIG_USB_NET1080
if (info->flags & FLAG_FRAMING_NC) {
- header->packet_id = cpu_to_le16 ((u16)dev->dev_packet_id++);
+ header->packet_id = cpu_to_le16 ((u16)dev->xid++);
put_unaligned (header->packet_id, &trailer->packet_id);
#if 0
devdbg (dev, "frame >tx h %d p %d id %d",
@@ -3779,6 +3659,7 @@ usbnet_probe (struct usb_interface *udev
dev->net = net;
strcpy (net->name, "usb%d");
memcpy (net->dev_addr, node_id, sizeof node_id);
+ dev->hard_mtu = net->mtu + net->hard_header_len;
#if 0
// dma_supported() is deeply broken on almost all architectures
@@ -3807,6 +3688,10 @@ usbnet_probe (struct usb_interface *udev
if ((dev->driver_info->flags & FLAG_ETHER) != 0
&& (net->dev_addr [0] & 0x02) == 0)
strcpy (net->name, "eth%d");
+
+ /* maybe the remote can't receive an Ethernet MTU */
+ if (net->mtu > (dev->hard_mtu - net->hard_header_len))
+ net->mtu = dev->hard_mtu - net->hard_header_len;
} else if (!info->in || info->out)
status = get_endpoints (dev, udev);
else {
@@ -3820,7 +3705,6 @@ usbnet_probe (struct usb_interface *udev
status = 0;
}
-
if (status == 0 && dev->status)
status = init_status (dev, udev);
if (status < 0)
@@ -4215,7 +4099,7 @@ static struct ethtool_ops usbnet_ethtool
/*-------------------------------------------------------------------------*/
-static int __init usbnet_init (void)
+static int __init usbnet_init(void)
{
// compiler should optimize these out
BUG_ON (sizeof (((struct sk_buff *)0)->cb)
@@ -4229,14 +4113,14 @@ static int __init usbnet_init (void)
return usb_register(&usbnet_driver);
}
-module_init (usbnet_init);
+module_init(usbnet_init);
-static void __exit usbnet_exit (void)
+static void __exit usbnet_exit(void)
{
- usb_deregister (&usbnet_driver);
+ usb_deregister(&usbnet_driver);
}
-module_exit (usbnet_exit);
+module_exit(usbnet_exit);
-MODULE_AUTHOR ("David Brownell <[EMAIL PROTECTED]>");
-MODULE_DESCRIPTION ("USB Host-to-Host Link Drivers (numerous vendors)");
-MODULE_LICENSE ("GPL");
+MODULE_AUTHOR("David Brownell");
+MODULE_DESCRIPTION("USB Host-to-Host Link Drivers (numerous vendors)");
+MODULE_LICENSE("GPL");
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ g26/drivers/usb/net/usbnet.h 2005-08-24 00:10:19.000000000 -0700
@@ -0,0 +1,150 @@
+/*
+ * USB Networking Link Interface
+ *
+ * Copyright (C) 2000-2005 by David Brownell <[EMAIL PROTECTED]>
+ * Copyright (C) 2003-2005 David Hollis <[EMAIL PROTECTED]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+
+#ifndef __USBNET_H
+#define __USBNET_H
+
+
+/* interface from usbnet core to each USB networking device we handle */
+struct usbnet {
+ /* housekeeping */
+ struct usb_device *udev;
+ struct driver_info *driver_info;
+ wait_queue_head_t *wait;
+
+ /* i/o info: pipes etc */
+ unsigned in, out;
+ struct usb_host_endpoint *status;
+ unsigned maxpacket;
+ struct timer_list delay;
+
+ /* protocol/interface state */
+ struct net_device *net;
+ struct net_device_stats stats;
+ int msg_enable;
+ unsigned long data [5];
+ u32 xid;
+ u32 hard_mtu; /* count any extra framing */
+ struct mii_if_info mii;
+
+ /* various kinds of pending driver work */
+ struct sk_buff_head rxq;
+ struct sk_buff_head txq;
+ struct sk_buff_head done;
+ struct urb *interrupt;
+ struct tasklet_struct bh;
+
+ struct work_struct kevent;
+ unsigned long flags;
+# define EVENT_TX_HALT 0
+# define EVENT_RX_HALT 1
+# define EVENT_RX_MEMORY 2
+# define EVENT_STS_SPLIT 3
+# define EVENT_LINK_RESET 4
+};
+
+
+/* interface from the device/framing level "minidriver" to core */
+struct driver_info {
+ char *description;
+
+ int flags;
+/* framing is CDC Ethernet, not writing ZLPs (hw issues), or optionally: */
+#define FLAG_FRAMING_NC 0x0001 /* guard against device dropouts */
+#define FLAG_FRAMING_GL 0x0002 /* genelink batches packets */
+#define FLAG_FRAMING_Z 0x0004 /* zaurus adds a trailer */
+#define FLAG_FRAMING_RN 0x0008 /* RNDIS batches, plus huge header */
+
+#define FLAG_NO_SETINT 0x0010 /* device can't set_interface() */
+#define FLAG_ETHER 0x0020 /* maybe use "eth%d" names */
+
+#define FLAG_FRAMING_AX 0x0040 /* AX88772/178 packets */
+
+ /* init device ... can sleep, or cause probe() failure */
+ int (*bind)(struct usbnet *, struct usb_interface *);
+
+ /* cleanup device ... can sleep, but can't fail */
+ void (*unbind)(struct usbnet *, struct usb_interface *);
+
+ /* reset device ... can sleep */
+ int (*reset)(struct usbnet *);
+
+ /* see if peer is connected ... can sleep */
+ int (*check_connect)(struct usbnet *);
+
+ /* for status polling */
+ void (*status)(struct usbnet *, struct urb *);
+
+ /* link reset handling, called from defer_kevent */
+ int (*link_reset)(struct usbnet *);
+
+ /* fixup rx packet (strip framing) */
+ int (*rx_fixup)(struct usbnet *dev, struct sk_buff *skb);
+
+ /* fixup tx packet (add framing) */
+ struct sk_buff *(*tx_fixup)(struct usbnet *dev,
+ struct sk_buff *skb, unsigned flags);
+
+ /* for new devices, use the descriptor-reading code instead */
+ int in; /* rx endpoint */
+ int out; /* tx endpoint */
+
+ unsigned long data; /* Misc driver specific data */
+};
+
+
+/* we record the state for each of our queued skbs */
+enum skb_state {
+ illegal = 0,
+ tx_start, tx_done,
+ rx_start, rx_done, rx_cleanup
+};
+
+struct skb_data { /* skb->cb is one of these */
+ struct urb *urb;
+ struct usbnet *dev;
+ enum skb_state state;
+ size_t length;
+};
+
+
+
+/* messaging support includes the interface name, so it must not be
+ * used before it has one ... notably, in minidriver bind() calls.
+ */
+#ifdef DEBUG
+#define devdbg(usbnet, fmt, arg...) \
+ printk(KERN_DEBUG "%s: " fmt "\n" , (usbnet)->net->name , ## arg)
+#else
+#define devdbg(usbnet, fmt, arg...) do {} while(0)
+#endif
+
+#define deverr(usbnet, fmt, arg...) \
+ printk(KERN_ERR "%s: " fmt "\n" , (usbnet)->net->name , ## arg)
+#define devwarn(usbnet, fmt, arg...) \
+ printk(KERN_WARNING "%s: " fmt "\n" , (usbnet)->net->name , ## arg)
+
+#define devinfo(usbnet, fmt, arg...) \
+ printk(KERN_INFO "%s: " fmt "\n" , (usbnet)->net->name , ## arg); \
+
+
+#endif /* __USBNET_H */
